I suppose/surmise by provisioning to accommodate those disabled by mobility issues and/or hearing loss is in many to cater for a smaller population & demographic.
If the view that such provisions are too little used is that potentially equally about such premises not actively promoting themselves as accessible? Afteral pet ownership is not limited to the able bodied!
It could be said, based on limited use/demand, that disabled parking bays get little use so why cannot the non blue badge disabled park there? Perhaps that is raisin d'etre of those inconsiderate enough to do so